Hi the HV350 amp working for me with single pair of MOSFET and +/-33V. It's only for testing. I am going to construct the full function amplifier🙂....
But the Toshiba transistors are not available in my nearest stores. for testing now i am using 2N5401&2N5551 instead of 2SA970&2SC2240. For other two complementary pairs i am using MJE340&MJE350 (sorry its only for testing). The amp works good but i want to match the perfect complementary pair for all the Toshiba transistors.
The transistor terminal changes not a problem, i will make the correction in my PCB design. My question is may i replace the 2SA970&2SC2240 pair with 2N5401&2N5551 permanently. What should be the equivalent transistors for other pairs and it should be easily available in market. Please give me a solution. Thank you.
Regards
Udhay
But the Toshiba transistors are not available in my nearest stores. for testing now i am using 2N5401&2N5551 instead of 2SA970&2SC2240. For other two complementary pairs i am using MJE340&MJE350 (sorry its only for testing). The amp works good but i want to match the perfect complementary pair for all the Toshiba transistors.
The transistor terminal changes not a problem, i will make the correction in my PCB design. My question is may i replace the 2SA970&2SC2240 pair with 2N5401&2N5551 permanently. What should be the equivalent transistors for other pairs and it should be easily available in market. Please give me a solution. Thank you.
Regards
Udhay
I try to use most available parts, and use design witch performance is independent of special parts. 2SA/2SC can be permanently replace with 2N, and you can replace other transistor, but try to maching hfe for simetry,
Regards
Hi,
I have a few questions about PSU-7.
What is it ? (features)
Where is the bottom side of the PCB, to make one.
Thanks,
Cambe
I have a few questions about PSU-7.
What is it ? (features)
Where is the bottom side of the PCB, to make one.
Thanks,
Cambe
Sorry for the very low quality pictures....
I am using DAINTY WOOFER
12" - 8Ω / ~240W
Attachments
hi apex it's me agin. can you post new picture of PCB of HV350.2 for print because some points on the PCB are in brown color example the points of the output transistors.
Regards.
Regards.
Look nice, but you must put driver transistors on heatsink with outputs, drivers work with 30mA bias and must be on heatsink. Better use some TO220 for drivers.
Regards
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Hv23 bias compensation
Regards
I set bias to 200mA, after 10min. amplifier was hot and bias decrease to 120mA. That's the fact for people who don't belive that HV23 have thermal stability. Thermal compensation with transistor in new version is need for do not underbiased not for overbiased amp.
Regards
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Yes thank you. But i already mention this is only for testing and now i am not using this amplifier. I am doing PCB work for final design,after that i will attach to heat sink and i didn't select an output transistor yet but i am thinking about MJE15032 & 33. What is your suggestion......
MJE15032 & 33 are not available in my city. It is only available in DIGIKEY. So may i use MJE350 & 340. It's get heat little more then output driver MOSFET(for +/-33 supply). Is it happen normally or anything wrong?
Go through an EFY ( Electronics For You ) magazine and contact parts suppliers from Mumbai and Bangalore . All you need to do is send an email and request for the part you want. You can get it fairly easily I think. Many suppliers respond to email requests now. Shipping isn't expensive.
Pcb
Hi Mile,
Do you have the PCB of this 10 mosfets amp project?
HV23? Post #1
Thanks,
Joel
Hi Mile,
Do you have the PCB of this 10 mosfets amp project?
HV23? Post #1
Thanks,
Joel
Yes, but I not recomand to use +/-90V with IRFP240/IRFP9240, no metter if U use 5 or more pairs mosfets,
Regards
How about +/- 80vdc for 5 pairs IRFP240/IRFP9240?
What's Pout @ 8 ohms?
Thanks,
Joel